King Engine Bearings MB5280XP.026 XP Tri-Metal Performance Main Bearing Set Ford V8 4.6L/5.4L SOHC

The King Engine Bearings MB5280XP.026 is a performance-grade crankshaft main bearing set engineered for the Ford V8 4.6L and 5.4L SOHC engine family. This is the .026" undersize version of the XP Series, designed for use with cranks that have been ground to the corresponding undersize. The set includes five pairs of main bearing shells plus thrust washers for a complete installation.

King's XP Series features a tri-metal copper-lead construction with the proprietary pMaxBlack™ overlay — a nano-scaled hardening process that modifies the molecular structure of the Babbitt overlay to create a fatigue-resistant shield. The result is an overlay capable of withstanding up to 10,200 PSI load capacity, making these bearings well-suited for high-performance and race-level build specifications.

Key Features:

• Tri-metal copper-lead construction — XP material for high-load, performance applications
• pMaxBlack™ overlay — proprietary nano-scaled hardening process for superior fatigue resistance and load capacity
• Bull's Eye Tolerance™ Technology — highly accurate machining with computerized wall thickness monitoring held to ±.0001" variation
• .026" undersize — for use with cranks ground to the .026" undersize specification
• Optimized 90° oil groove geometry — maintains oil flow and expands surface area to increase load capacity
• Includes thrust washers — complete main bearing set for a full engine rebuild
• Suitable for circle track, drag racing, off-shore, and other applications using steel crankshafts

King Engine Bearings has specialized exclusively in engine bearings since 1960, supplying the automotive, performance, marine, and aviation industries. Every bearing in the XP line undergoes rigorous quality control checkpoints during manufacturing, ensuring consistent wall thickness and precise fit from bearing to bearing — reducing the need for multiple test-fit sets during assembly.